• Irregular, yellowish, translucent sports on the upper surface of the leaves.
• Correspondingly on the lower surface, white, powdery growth on leaves.
• Affected leaves become, yellow, brown and gets dried.
• Premature defoliation.
• Dwarfing of tender shoots.
• Brown, sunken lesions on the stem.
• White growth of fungus on berries which subsequently becomes leathery and
• shrivels.
• Later infection of berries result in soft rot symptoms.
• No cracking of the skin of the berries.

• Spread : Through sporangia by wind, rain etc.
• Survival : As oospores present in the infected leaves, shoots and berries. Also as
• dormant mycelium in infected twigs.
• Optimum temperature : 20-22°C
• Relative humidity : 80-100 per cent

Management

• Spray Bordeaux mixture 1 % or Metalaxyl + Mancozeb 0.4 %.